Junior High School Back to School Pool Party, 1 p.m.-4 p.m., Lawrence Aquatic Center, 727 Ky. First 150 junior high students get in free, sponsored by Wednesdays @ Liberty Hall, www.walhonline.org, 843-8985.

"Billy Yank: A Common Soldier of the Civil War Union Army," by Dr. Herschel and Jacque Stroud, 2 p.m., Watkins Community Museum of History, 1047 Mass., free, 841-4109.